The double-bar delimiter does not stretch in MathJax v2.2

Created by: robjohn

This does not appear in MathJax v2.1. In the following code, the \left|...\right| delimiters do not stretch as the \left{...\right} do

$$ \begin{array}{cc} | \frac{a}{b} | & \left| \frac{a}{b} \right| \ { \frac{a}{b} } & \left{ \frac{a}{b} \right} \end{array} $$

This bug was noted on math.stackexchange: http://meta.math.stackexchange.com/q/9647

This problem also appears with \lVert \rVert \lvert and \rvert delimiters.